Can you install an iPhone 7 screen into an iPhone 6S?

So, I shattered the glass on my display a few days ago and just took it to Apple to get replaced. The representative at my local store was really helpful and offered to swap my battery as well (due to the fact that apparently the first batch of 6S's had restarting issues due to a battery malfunction). I just got my phone back and I swear the colors on the screen seem better. I always thought the colors on my phone when I first got it were a little washed out and blue compared to other iPhone displays, but didn't know how to raise the issue with Apple since it wasn't glaringly obvious and it didn't affect the usability of my phone at all.

Now I am wondering if the display was actually a little defective and my replacement display is what it should have been all along...OR is there any chance I actually got an iPhone 7 screen installed (wider color gamut and better color accuracy)? I am guessing not because the home button is still clicky rather than the taptic button on the iPhone 7. However, that got me wondering: would it be theoretically possible to install a replacement iPhone 7 screen onto an iPhone 6S since they are the exact same dimensions? That would be a nice little upgrade and might even help with water proofing if the solid state button works. Just a thought.

Also, while I am here I just want to ask if anyone knows whether Apple definitely replaces the LCD when they fix a broken screen? In theory it was just the glass that was broken on my phone - the panel itself worked fine, though I have a feeling Apple swaps the whole thing. Confirm or deny?

Thanks!